When is LiDAR navigation essential for a robot vacuum?

LiDAR navigation is essential when your home has furniture legs, toys, stairs, or general clutter — not just an open rectangle. The [Roborock Q](https://www.amazon.com/s?k=Roborock+Q&tag=wehavethat-20)10V uses LiDAR and SLAM to map rooms and track its position, while the Dreame D20 relies on bump sensors and guesswork. In tight corners or cluttered spaces, LiDAR is the difference between a vacuum that cleans and one that wanders.